Sarah Ricker

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A computational homogenization procedure for a material layer that possesses an underlying heterogeneous microstructure is introduced within the framework of finite deformations. The macroscopic material properties of the material layer are obtained from multiscale considerations. At the macro level, the layer is resolved as a cohesive interface situated(More)
This is the second and final part of our digital rock physics (DRP) benchmarking study. We use segmented 3-D images (one for Fontainebleau, three for Berea, three for a carbonate, and one for a sphere pack) to directly compute the absolute permeability, the electrical resistivity, and elastic moduli. The numerical methods tested include a finite-element(More)
The present study quantifies the autonomic block, the cardiovascular depression and the histamine releasing effects of polymyxin B in nine anaesthetized cats. The dose requirements for 50 per cent depression of the mean arterial blood pressure, the bradycardiac response to vagal stimulation, and the contraction of the nictitating membrane elicited by(More)
The induction of halothane anesthesia following intravenous administration of aminophylline may cause ventricular arrhythmias. This study was designed to determine whether induction of enflurane anesthesia following intravenous aminophylline is arrhythmogenic in dogs. One group of six dogs was anesthetized with 2% enflurane in the absence of aminophylline.(More)
Arrhythmogenic effects of aminophylline (theophylline ethylenediamine) during halothane anesthesia have been reported but have not been related to serum theophylline levels. This study was designed to determine the arrhythmogenicity of therapeutic and toxic serum theophylline levels during halothane anesthesia. The study consisted of three parts. In part 1(More)
Conditioned suppression was used with rats to study the effects of extending conditioned stimuli (CSs) before versus after the delivery of unconditioned stimuli. These extensions are termed B and A extensions, respectively. Within-group designs were used to compare the effects of extending CSs when 2-min parts of those CSs were separated by temporal gaps of(More)
The induction of halothane anesthesia following intravenous administration of aminophylline may cause ventricular arrhythmias. Ketamine has been recommended for anesthesia induction and maintenance in patients with asthma. This study was designed to determine whether induction and maintenance of ketamine anesthesia following intravenous aminophylline is(More)
Many simulations of grinding processes focus on the penetration of a grinding wheel and a workpiece and neglect displacements of the machine system. This paper presents a modular concept and initial applications for developing a comprehensive simulation of the grinding process and the grinding machine.
Cardiac arrhythmias often occur when patients receiving aminophylline are anesthetized with halothane. This animal study was designed to define what constitute arrhythmogenic doses of aminophylline when administered before halothane anesthesia. One group of six dogs was given aminophylline, 10 mg/kg IV, followed in 3 minutes by inhalation of 1% halothane.(More)